Final answer:
After installation, window flanges require sealing with flashing and sealants to protect against water and air infiltration, ensuring the window's integrity and performance.
Step-by-step explanation:
When discussing installation practices for window flanges, it is essential to highlight the need for proper sealing after they are installed. Window flanges are the part of the window that extends outward and attaches to the building structure, providing a surface for mounting and sealing the window in place.
After installation, window flanges require a barrier against water and air infiltration to ensure the integrity of the window installation. This is typically achieved using flashing and sealants. Flashing is a thin layer of impervious material that directs water away from the window to prevent it from entering the wall assembly. Sealants, like caulks or foam, are applied to fill gaps and provide a watertight seal around the window flange. These measures are critical to maintaining the functionality and energy efficiency of the window, as well as preventing moisture-related damage to the surrounding structures.
It is vital for the flashing to properly overlaps the window flange and integrates with the weather-resistive barrier (WRB) of the building. Sealants should be compatible with all materials they contact and be applied following the manufacturer's instructions for best performance. These steps are necessary measures to protect the building and sustain the window's performance over time.